LT3695HMSE#PBF

LT3695HMSE#PBF Application Field and Working Principle

The LT3695HMSE#PBF is a member of Linear Technology\'s family of DC/DC switching regulators. The device is a synchronous buck regulator featuring a high efficiency, constant frequency current mode operation. The LT3695HMSE#PBF is capable of delivering up to 4A of output current across an input voltage range from 3V to 20V. The device provides a wide range of output voltage settings from 0.6V to 1.8V.

The LT3695HMSE#PBF is ideal for powering FPGAs, ASICs, DSPs and microprocessors where output voltage sequencing and tracking is required. It is also suitable for multi-rail power supplies requiring excellent line and load regulation, as well as efficient operation. Other features of the LT3695HMSE#PBF include its over-current protection, temperature monitoring and over-voltage protection capabilities.

LT3695HMSE#PBF Working Principle

The LT3695HMSE#PBF features a synchronous buck converter architecture that operates in continuous mode. The device employs a current mode control architecture consisting of an error amplifier, a voltage reference and an oscillator. The error amplifier is used to compare the output voltage with the internal reference voltage and adjust the oscillator frequency accordingly. A PWM comparator generates a fixed frequency, variable duty cycle pulse width modulated (PWM) switching signal that is used to control the power output stage. The power stage uses power MOSFETs operating in parallel in the main switch, synchronizing secondary switches with the main switch, and providing diode recovery. The LT3695HMSE#PBF uses a bootstrap diode to provide hysteresis on the loop control, which stabilizes the operating frequency and reduces the impact of ripple on the output voltage control.

The LT3695HMSE#PBF also features built-in protection features such as overcurrent protection and temperature monitoring. The device also provides an adjustable overvoltage protection (OVP) setting that can be used for system level protection. The OVP monitors the output voltage and will shut down the converter if the output voltage exceeds the set point, preventing potential damage to the system.

Conclusion

The Linear Technology LT3695HMSE#PBF is an advanced synchronous buck regulator featuring high efficiency, constant frequency current mode operation. It is suitable for powering FPGAs, ASICs, DSPs and microprocessors, as well as for multi-rail power supplies requiring excellent line and load regulation. The device is capable of delivering up to 4A of output current with a wide range of output voltage settings from 0.6V to 1.8V. It also features built-in protection features such as overcurrent protection and temperature monitoring, as well as an adjustable overvoltage protection setting.